Merge pull request #6789 from volta-networks/feat_ldp_igp_sync

ldpd: Add support for LDP-IGP Synchronization

1 files changed, 93 insertions, 0 deletions

diff --git a/lib/ldp_sync.c b/lib/ldp_sync.c
new file mode 100644
index 0000000000..5dd045d88d
--- /dev/null
+++ b/lib/ldp_sync.c
@@ -0,0 +1,93 @@
+/*
+ * ldp_sync.c: LDP-SYNC handling routines
+ * Copyright (C) 2020 Volta Networks, Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 2 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; see the file COPYING; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <zebra.h>
+
+#include "command.h"
+#include "memory.h"
+#include "prefix.h"
+#include "log.h"
+#include "thread.h"
+#include "stream.h"
+#include "zclient.h"
+#include "table.h"
+#include "vty.h"
+#include "ldp_sync.h"
+
+/* Library code */
+DEFINE_MTYPE_STATIC(LIB, LDP_SYNC_INFO, "LDP SYNC info")
+
+/*
+ * ldp_sync_info_create - Allocate the LDP_SYNC information
+ */
+struct ldp_sync_info *ldp_sync_info_create(void)
+{
+	struct ldp_sync_info *ldp_sync_info;
+
+	ldp_sync_info = XCALLOC(MTYPE_LDP_SYNC_INFO,
+				sizeof(struct ldp_sync_info));
+	assert(ldp_sync_info);
+
+	ldp_sync_info->flags = 0;
+	ldp_sync_info->enabled = LDP_IGP_SYNC_DEFAULT;
+	ldp_sync_info->state = LDP_IGP_SYNC_STATE_NOT_REQUIRED;
+	ldp_sync_info->holddown = LDP_IGP_SYNC_HOLDDOWN_DEFAULT;
+	ldp_sync_info->t_holddown = NULL;
+	return ldp_sync_info;
+}
+
+/*
+ * ldp_sync_info_free - Free the LDP_SYNC information.
+ */
+void ldp_sync_info_free(struct ldp_sync_info **ldp_sync_info)
+{
+	if (*ldp_sync_info)
+		XFREE(MTYPE_LDP_SYNC_INFO, *ldp_sync_info);
+}
+
+bool ldp_sync_if_is_enabled(struct ldp_sync_info *ldp_sync_info)
+{
+	/* return true if LDP-SYNC is configured on this interface */
+	if (ldp_sync_info &&
+	    ldp_sync_info->enabled == LDP_IGP_SYNC_ENABLED &&
+	    ldp_sync_info->state == LDP_IGP_SYNC_STATE_REQUIRED_NOT_UP)
+		return true;
+
+	return false;
+}
+
+bool ldp_sync_if_down(struct ldp_sync_info *ldp_sync_info)
+{
+	/* Stop LDP-SYNC on this interface:
+	 *   if holddown timer is running stop it
+	 *   update state
+	 */
+	if (ldp_sync_info && ldp_sync_info->enabled == LDP_IGP_SYNC_ENABLED) {
+		if (ldp_sync_info->t_holddown != NULL) {
+			THREAD_TIMER_OFF(ldp_sync_info->t_holddown);
+			ldp_sync_info->t_holddown = NULL;
+		}
+		if (ldp_sync_info->state == LDP_IGP_SYNC_STATE_REQUIRED_UP)
+			ldp_sync_info->state =
+				LDP_IGP_SYNC_STATE_REQUIRED_NOT_UP;
+		return true;
+	}
+
+	return false;
+}